212022221 has 4 divisors (see below), whose sum is σ = 212187744. Its totient is φ = 211856700.

The previous prime is 212022191. The next prime is 212022227. The reversal of 212022221 is 122220212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212022221 - 2⁶ = 212022157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212022196 and 212022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212022227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80825 + ... + 83406.

It is an arithmetic number, because the mean of its divisors is an integer number (53046936).

Almost surely, 2^212022221 is an apocalyptic number.

It is an amenable number.

212022221 is a deficient number, since it is larger than the sum of its proper divisors (165523).

212022221 is a wasteful number, since it uses less digits than its factorization.

212022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165522.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 212022221 is about 14560.9828308394. The cubic root of 212022221 is about 596.2940280445.

Adding to 212022221 its reverse (122220212), we get a palindrome (334242433).

The spelling of 212022221 in words is "two hundred twelve million, twenty-two thousand, two hundred twenty-one".